A Calculus of Angels
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A Calculus of Angels is an alternate history and fantasy novel by American writer Gregory Keyes, the second book in The Age of Unreason series.<ref>Template:Cite web</ref><ref>Template:Cite web</ref> It was initially published by Del Rey on March 30, 1999. A follow-up to Newton's Cannon, the book is set in 1722 and continues the alternate history where Isaac Newton discovers that alchemy works, and a powerful science is built upon it.
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- "A Calculus of Angels (Book)." Publishers Weekly 246.12 (22 March 1999): 74.
- Green, Roland. "Adult books: Fiction." Booklist 95.16 (15 April 1999): 1518.
- Cassada, Jackie, and Barbara Hoffert. "Book Reviews: Fiction." Library Journal 124.7 (15 April 1999): 148.
- Vretos, Linda A., and Trevelyn E. Jones. "Adult/Young Adult: Fiction." School Library Journal 46.1 (January 2000): 156.